:root {
  color-scheme: light;
  --duration-stagger: 40ms;
  --duration-micro: 80ms;
  --duration-quick: 150ms;
  --duration-fast: 250ms;
  --duration-medium: 350ms;
  --duration-slow: 400ms;
  --duration-very-slow: 500ms;
  --ease-smooth-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: ease-in-out;
  --ease-out: ease-out;
  --ease-linear: linear;
  --scale-large: 0.96;
  --learn-shift: 2px;
  --learn-spread: 8deg;
  --learn-in: 350ms;
  --learn-out: 350ms;
  --learn-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --bg: oklch(0.985 0.008 72);
  --surface: oklch(0.995 0.004 72);
  --text: oklch(0.22 0.02 40);
  --muted: oklch(0.38 0.018 40);
  --faint: oklch(0.5 0.014 40);
  --line: oklch(0.9 0.01 70);
  --line-strong: oklch(0.76 0.016 50);
  --accent: oklch(0.42 0.135 28);
  --accent-hover: oklch(0.36 0.13 28);
  --on-accent: oklch(0.99 0.004 72);
  --radius-md: 8px;
  --shell: min(42rem, calc(100vw - 40px));
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
}

::selection {
  color: var(--text);
  background: oklch(0.42 0.135 28 / 0.18);
}

a {
  color: inherit;
}

.shell {
  width: var(--shell);
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--on-accent);
  background: var(--accent);
  font-weight: 650;
  transform: translateY(-160%);
}

.skip-link:focus-visible {
  transform: none;
}

.catalog {
  padding: clamp(48px, 7vw, 72px) 0 56px;
}

.catalog-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(200px, 16rem);
  gap: 24px 32px;
  align-items: end;
  margin-bottom: 12px;
}

.catalog-copy {
  display: grid;
  gap: 6px;
}

.site-name {
  margin: 0;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 650;
}

.section-label {
  margin: 0;
  color: var(--text);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.result-count {
  margin: 0;
  color: var(--muted);
  font-size: 0.875rem;
}

.search-field {
  position: relative;
}

.search-field label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.search-field input {
  width: 100%;
  min-height: 48px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  color: var(--text);
  background: transparent;
  font: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color var(--duration-quick) var(--ease-out);
}

.search-field input::placeholder {
  color: var(--faint);
}

.search-field input:focus-visible {
  border-bottom-color: var(--accent);
}

.episode-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.episode-card {
  position: relative;
  display: grid;
  gap: 10px;
  padding: 28px 0 24px;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}

.episode-card[hidden] {
  display: none;
}

.episode-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  margin: 0;
}

.episode-meta div {
  display: flex;
  gap: 6px;
  align-items: baseline;
}

.episode-meta dt,
.episode-meta dd {
  margin: 0;
  font-size: 0.8125rem;
}

.episode-meta dt {
  color: var(--faint);
}

.episode-meta dd {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.episode-card h2 {
  max-width: 42rem;
  margin: 0;
  font-size: 1.25rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.3;
  text-wrap: balance;
}

.episode-card h2 a {
  text-decoration-color: transparent;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.12em;
  transition:
    color var(--duration-quick) var(--ease-out),
    text-decoration-color var(--duration-quick) var(--ease-out);
}

.episode-card h2 a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.episode-summary {
  max-width: 42rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  overflow-wrap: break-word;
  text-wrap: pretty;
}

.episode-footer {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  padding-top: 6px;
}

.button {
  display: inline-flex;
  width: auto;
  min-height: 40px;
  min-width: 4.5rem;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 650;
  text-decoration: none;
  transition-property: border-color, background-color, color, transform;
  transition-duration: var(--duration-quick);
  transition-timing-function: var(--ease-out);
}

.source-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin: 0;
}

.source-link {
  color: var(--muted);
  font-size: 0.8125rem;
  text-decoration-thickness: from-font;
  text-underline-offset: 0.18em;
}

.source-link:hover {
  color: var(--accent);
}

.button:active {
  transform: scale(0.96);
}

.button:focus-visible,
.episode-card h2 a:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

.button-primary {
  color: var(--on-accent);
  background: var(--accent);
}

.button-primary:hover {
  background: var(--accent-hover);
}

.button-secondary {
  border-color: var(--line-strong);
  color: var(--muted);
  background: var(--surface);
}

.button-secondary:hover {
  border-color: var(--accent);
  color: var(--text);
}

.t-learn-chevron {
  display: inline-flex;
  transform: translateX(0);
  transition: transform var(--learn-out) var(--learn-ease);
}

.t-learn-chevron svg {
  display: block;
  width: 16px;
  height: 16px;
}

.t-learn-arm {
  transform-box: view-box;
  transform-origin: 10px 8px;
  vector-effect: non-scaling-stroke;
  transition: transform var(--learn-out) var(--learn-ease);
}

.t-learn:hover .t-learn-chevron {
  transform: translateX(var(--learn-shift));
  transition-duration: var(--learn-in);
}

.t-learn:hover .t-learn-arm {
  transition-duration: var(--learn-in);
}

.t-learn:hover .t-learn-arm-top {
  transform: rotate(var(--learn-spread));
}

.t-learn:hover .t-learn-arm-bot {
  transform: rotate(calc(var(--learn-spread) * -1));
}

.empty-state {
  margin: 48px 0;
  padding: 0;
  border: 0;
  color: var(--muted);
  text-align: start;
}

.site-footer {
  margin-top: 8px;
  padding: 28px 0 56px;
  color: var(--faint);
  font-size: 0.8rem;
}

.site-footer p {
  max-width: 42rem;
  margin: 0;
}

.error-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.error-card {
  width: min(40rem, 100%);
  padding: clamp(24px, 6vw, 48px) 0;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  background: transparent;
}

.error-card h1 {
  margin: 0;
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.error-card > p {
  margin: 16px 0 28px;
  color: var(--muted);
}

@media (prefers-contrast: more) {
  :root {
    --muted: oklch(0.3 0.02 40);
    --faint: oklch(0.34 0.018 40);
    --line: oklch(0.68 0.016 50);
    --line-strong: oklch(0.52 0.02 40);
    --accent: oklch(0.34 0.12 28);
  }
}

@media (max-width: 760px) {
  :root {
    --shell: min(100% - 28px, 42rem);
  }

  .catalog {
    padding-top: 36px;
  }

  .catalog-heading {
    grid-template-columns: 1fr;
    align-items: stretch;
    gap: 20px;
  }

  .episode-card {
    padding: 24px 0 20px;
  }
}

@media (max-width: 620px) {
  .episode-footer {
    align-items: stretch;
  }

  .episode-footer .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }

  .button:hover,
  .button:active {
    transform: none;
  }

  .t-learn-chevron,
  .t-learn-arm {
    transition: none !important;
  }
}

@media print {
  body {
    color: #111;
    background: #fff;
  }

  .search-field,
  .episode-actions,
  .site-footer {
    display: none;
  }

  .catalog {
    padding-top: 0;
  }

  .episode-card {
    border-bottom: 1px solid #bbb;
    color: #111;
    background: #fff;
    box-shadow: none;
  }

  .episode-summary,
  .episode-meta dt,
  .episode-meta dd {
    color: #333;
  }
}